/****************************************************************
 *								*
 *	Copyright 2001, 2007 Fidelity Information Services, Inc	*
 *								*
 *	This source code contains the intellectual property	*
 *	of its copyright holder(s), and is made available	*
 *	under a license.  If you do not know the terms of	*
 *	the license, please stop and do not read further.	*
 *								*
 ****************************************************************/

/*
   mur_blocks_free = # of free blocks
*/
#include "mdef.h"

#include "gtm_string.h"
#include "gdsroot.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "gdsblk.h"
#include "gdsbml.h"
#include "jnl.h"
#include "buddy_list.h"
#include "hashtab_int4.h"	/* needed for muprec.h */
#include "hashtab_int8.h"	/* needed for muprec.h */
#include "hashtab_mname.h"	/* needed for muprec.h */
#include "muprec.h"
#include "iosp.h"
#include "util.h"
#include "dbfilop.h"
#include "gds_blk_upgrade.h"	/* for gds_blk_upgrade prototype and GDS_BLK_UPGRADE_IF_NEEDED macro */

GBLREF	gd_region		*gv_cur_region;
GBLREF	sgmnt_data_ptr_t	cs_data;
GBLREF	reg_ctl_list		*mur_ctl;
GBLREF	int			mur_regno;

#define BPL	sizeof(int4)*8/BML_BITS_PER_BLK					/* blocks masked by a int4 */

int4 mur_blocks_free()
{
	int4		x;
	block_id 	bnum;
	int 		maps, mapsize, i, j, k, fcnt, status;
	unsigned char 	*disk, *c, *m_ptr;
	uint4 		*dskmap, map_blk_size;
	file_control 	*db_ctl;
	enum db_ver	dummy_ondskblkver;

	error_def(ERR_DBRDERR);
	error_def(ERR_DYNUPGRDFAIL);

	db_ctl = mur_ctl[mur_regno].db_ctl;
	cs_data = mur_ctl[mur_regno].csd;
	fcnt = 0;
	maps = (cs_data->trans_hist.total_blks + cs_data->bplmap - 1) / cs_data->bplmap;
	map_blk_size = BM_SIZE(cs_data->bplmap);
	m_ptr = (unsigned char*)malloc(cs_data->blk_size + 8);
	disk = (unsigned char *)(((UINTPTR_T)m_ptr) + 7 & (UINTPTR_T)(-8L));
	db_ctl->op_buff = (uchar_ptr_t)disk;
	db_ctl->op_len = cs_data->blk_size;
	for (i = 0; i != maps; i++)
	{
		bnum = i * cs_data->bplmap;
		db_ctl->op = FC_READ;
		db_ctl->op_pos = cs_data->start_vbn + (cs_data->blk_size / DISK_BLOCK_SIZE * bnum);
		status = dbfilop(db_ctl);
		if (SYSCALL_ERROR(status))
			rts_error(VARLSTCNT(5) ERR_DBRDERR, 2, DB_LEN_STR(gv_cur_region), status);
		GDS_BLK_UPGRADE_IF_NEEDED(bnum, disk, disk, cs_data, &dummy_ondskblkver, status, cs_data->fully_upgraded);
		if (SS_NORMAL != status)
			if (ERR_DYNUPGRDFAIL == status)
				rts_error(VARLSTCNT(5) status, 3, bnum, DB_LEN_STR(gv_cur_region));
			else
				rts_error(VARLSTCNT(1) status);
		if (((blk_hdr *)disk)->bsiz != map_blk_size)
		{
			util_out_print("Wrong size map block", TRUE);
			continue;
		}
		if (((blk_hdr *)disk)->levl != LCL_MAP_LEVL)
			util_out_print("Local map block level incorrect.", TRUE);
		mapsize = (bnum == (cs_data->trans_hist.total_blks/cs_data->bplmap) * cs_data->bplmap ?
				     cs_data->trans_hist.total_blks - bnum : cs_data->bplmap);
		j = BPL;
		dskmap = (uint4*)(disk + sizeof(blk_hdr));
		while (j < mapsize)
		{
			for (k = 0; k != sizeof(int4) * 8; k += BML_BITS_PER_BLK)
				fcnt += (*dskmap >> k) & 1;
			j += BPL;
			dskmap++;
		}
		c = (unsigned char *)dskmap;
		j -= BPL;
		j += 4;
		while (j < mapsize)
		{
			for (k = 0; k != 8; k += BML_BITS_PER_BLK)
				fcnt += (*c >> k) & 1;
			j += 4;
			c++;
		}

		x = (mapsize + 4 - j) * BML_BITS_PER_BLK;
		for (k = 0; k < x; k += BML_BITS_PER_BLK)
			fcnt += (*c >> k) & 1;
	}
	free(m_ptr);
	return fcnt;
}
